Gta3 burned cd's

I recently got a CD of GTA3 from a friend of mine and he said something about downloading a program to ‘mount’ the image. I know a bit but not too much about CD burning, but I can’t remember what program he said to use. The file is .ISO and he mentioned something about virtual cd rom drives, can anybody help me here? What program do I have to use?

Just use something like daemon tools or if you have a burner use Nero to write the image.

thank you very much! that was the name of the program he said…Daemon tools!